The Tetragrammaton

The Tetragrammaton is the holy "four-lettered name" of God. Remembering that Hebrew
is read from right to left, this name, yod-heh-vav-heh, is most properly transliterated as YHVH,
but sometimes as YHWH (Yahweh) or JHVH (Jehovah). Even though it is the name of God that appears most frequently in the Hebrew Bible,
the Tetragrammaton is considered so sacred in Judaism that it isn't spoken aloud and is instead replaced by euphemisms such as
Adonai ("Lord") or ha shem ("the name").